Note to self: Google Authenticator + oneiric

install Google-Authenticator app on whatever device you prefer

Then you do this on Ubuntu 11.10 (oneric):
git clone https://code.google.com/p/google-authenticator/

install libqrencode library
install libpam0g-dev

cd google-authenticator
sudo make install

run google-authenticator
Time-based tokens: Y
Scan the QR code you get up on screen with your authenticator app
Update .google-authenticator file: Y
Disallow use of same authentication token: Y
Increase window for time-skew: N
Rate-limiting: Y

insert auth required pam_google_authenticator-so into your /etc/pam.d/sshd file
sudo restart ssh

go.